Initial Commit

2018-02-08 21:28:33 -05:00
commit 678c1d3966
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+/*=============================================================================
+    Copyright (c) 2001-2011 Joel de Guzman
+
+    Distributed under the Boost Software License, Version 1.0. (See accompanying 
+    file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
+==============================================================================*/
+#if !defined(FUSION_SEQUENCE_FILTER_VIEW_HPP)
+#define FUSION_SEQUENCE_FILTER_VIEW_HPP
+
+#include <boost/fusion/support/config.hpp>
+#include <boost/fusion/support/detail/access.hpp>
+#include <boost/fusion/support/sequence_base.hpp>
+#include <boost/fusion/support/is_view.hpp>
+#include <boost/fusion/view/filter_view/filter_view_iterator.hpp>
+#include <boost/fusion/view/filter_view/detail/begin_impl.hpp>
+#include <boost/fusion/view/filter_view/detail/end_impl.hpp>
+#include <boost/fusion/view/filter_view/detail/size_impl.hpp>
+#include <boost/fusion/sequence/intrinsic/begin.hpp>
+#include <boost/fusion/sequence/intrinsic/end.hpp>
+#include <boost/mpl/bool.hpp>
+#include <boost/mpl/eval_if.hpp>
+#include <boost/mpl/inherit.hpp>
+#include <boost/mpl/identity.hpp>
+
+namespace boost { namespace fusion
+{
+    struct filter_view_tag;
+    struct forward_traversal_tag;
+    struct fusion_sequence_tag;
+
+    template <typename Sequence, typename Pred>
+    struct filter_view : sequence_base<filter_view<Sequence, Pred> >
+    {
+        typedef filter_view_tag fusion_tag;
+        typedef fusion_sequence_tag tag; // this gets picked up by MPL
+        typedef typename
+            mpl::eval_if<
+                traits::is_associative<Sequence>
+              , mpl::inherit2<forward_traversal_tag,associative_tag>
+              , mpl::identity<forward_traversal_tag>
+            >::type
+        category;
+        typedef mpl::true_ is_view;
+
+        typedef typename result_of::begin<Sequence>::type first_type;
+        typedef typename result_of::end<Sequence>::type last_type;
+        typedef Pred pred_type;
+
+        BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
+        filter_view(Sequence& in_seq)
+            : seq(in_seq)
+        {}
+
+        BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
+        first_type first() const { return fusion::begin(seq); }
+        BOOST_CONSTEXPR BOOST_FUSION_GPU_ENABLED
+        last_type last() const { return fusion::end(seq); }
+        typename mpl::if_<traits::is_view<Sequence>, Sequence, Sequence&>::type seq;
+
+    private:
+        // silence MSVC warning C4512: assignment operator could not be generated
+        filter_view& operator= (filter_view const&);
+    };
+}}
+
+#endif
+
+